304 lines
7.3 KiB
C
304 lines
7.3 KiB
C
/* $FreeBSD$ */
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/* $KAME: scope6.c,v 1.10 2000/07/24 13:29:31 itojun Exp $ */
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/*
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* Copyright (C) 2000 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/systm.h>
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#include <sys/queue.h>
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#include <net/route.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/scope6_var.h>
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struct scope6_id {
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/*
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* 16 is correspondent to 4bit multicast scope field.
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* i.e. from node-local to global with some reserved/unassigned types.
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*/
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u_int32_t s6id_list[16];
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};
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static size_t if_indexlim = 8;
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struct scope6_id *scope6_ids = NULL;
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void
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scope6_ifattach(ifp)
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struct ifnet *ifp;
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{
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int s = splnet();
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/*
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* We have some arrays that should be indexed by if_index.
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* since if_index will grow dynamically, they should grow too.
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*/
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if (scope6_ids == NULL || if_index >= if_indexlim) {
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size_t n;
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caddr_t q;
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while (if_index >= if_indexlim)
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if_indexlim <<= 1;
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/* grow scope index array */
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n = if_indexlim * sizeof(struct scope6_id);
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/* XXX: need new malloc type? */
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q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK);
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bzero(q, n);
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if (scope6_ids) {
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bcopy((caddr_t)scope6_ids, q, n/2);
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free((caddr_t)scope6_ids, M_IFADDR);
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}
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scope6_ids = (struct scope6_id *)q;
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}
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#define SID scope6_ids[ifp->if_index]
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/* don't initialize if called twice */
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if (SID.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL]) {
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splx(s);
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return;
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}
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/*
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* XXX: IPV6_ADDR_SCOPE_xxx macros are not standard.
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* Should we rather hardcode here?
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*/
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SID.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index;
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#ifdef MULTI_SCOPE
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/* by default, we don't care about scope boundary for these scopes. */
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SID.s6id_list[IPV6_ADDR_SCOPE_SITELOCAL] = 1;
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SID.s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL] = 1;
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#endif
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#undef SID
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splx(s);
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}
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int
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scope6_set(ifp, idlist)
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struct ifnet *ifp;
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u_int32_t *idlist;
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{
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int i, s;
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int error = 0;
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if (scope6_ids == NULL) /* paranoid? */
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return(EINVAL);
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/*
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* XXX: We need more consistency checks of the relationship among
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* scopes (e.g. an organization should be larger than a site).
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*/
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/*
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* TODO(XXX): after setting, we should reflect the changes to
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* interface addresses, routing table entries, PCB entries...
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*/
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s = splnet();
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for (i = 0; i < 16; i++) {
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if (idlist[i] &&
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idlist[i] != scope6_ids[ifp->if_index].s6id_list[i]) {
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if (i == IPV6_ADDR_SCOPE_LINKLOCAL &&
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idlist[i] > if_index) {
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/*
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* XXX: theoretically, there should be no
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* relationship between link IDs and interface
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* IDs, but we check the consistency for
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* safety in later use.
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*/
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splx(s);
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return(EINVAL);
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}
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/*
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* XXX: we must need lots of work in this case,
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* but we simply set the new value in this initial
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* implementation.
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*/
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scope6_ids[ifp->if_index].s6id_list[i] = idlist[i];
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}
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}
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splx(s);
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return(error);
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}
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int
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scope6_get(ifp, idlist)
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struct ifnet *ifp;
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u_int32_t *idlist;
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{
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if (scope6_ids == NULL) /* paranoid? */
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return(EINVAL);
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bcopy(scope6_ids[ifp->if_index].s6id_list, idlist,
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sizeof(scope6_ids[ifp->if_index].s6id_list));
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return(0);
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}
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/*
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* Get a scope of the address. Node-local, link-local, site-local or global.
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*/
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int
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in6_addrscope(addr)
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struct in6_addr *addr;
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{
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int scope;
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if (addr->s6_addr8[0] == 0xfe) {
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scope = addr->s6_addr8[1] & 0xc0;
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switch (scope) {
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case 0x80:
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return IPV6_ADDR_SCOPE_LINKLOCAL;
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break;
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case 0xc0:
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return IPV6_ADDR_SCOPE_SITELOCAL;
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break;
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default:
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return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */
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break;
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}
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}
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if (addr->s6_addr8[0] == 0xff) {
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scope = addr->s6_addr8[1] & 0x0f;
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/*
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* due to other scope such as reserved,
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* return scope doesn't work.
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*/
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switch (scope) {
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case IPV6_ADDR_SCOPE_NODELOCAL:
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return IPV6_ADDR_SCOPE_NODELOCAL;
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break;
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case IPV6_ADDR_SCOPE_LINKLOCAL:
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return IPV6_ADDR_SCOPE_LINKLOCAL;
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break;
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case IPV6_ADDR_SCOPE_SITELOCAL:
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return IPV6_ADDR_SCOPE_SITELOCAL;
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break;
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default:
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return IPV6_ADDR_SCOPE_GLOBAL;
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break;
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}
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}
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if (bcmp(&in6addr_loopback, addr, sizeof(*addr) - 1) == 0) {
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if (addr->s6_addr8[15] == 1) /* loopback */
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return IPV6_ADDR_SCOPE_NODELOCAL;
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if (addr->s6_addr8[15] == 0) /* unspecified */
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return IPV6_ADDR_SCOPE_LINKLOCAL;
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}
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return IPV6_ADDR_SCOPE_GLOBAL;
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}
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int
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in6_addr2scopeid(ifp, addr)
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struct ifnet *ifp; /* must not be NULL */
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struct in6_addr *addr; /* must not be NULL */
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{
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int scope = in6_addrscope(addr);
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if (scope6_ids == NULL) /* paranoid? */
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return(0); /* XXX */
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if (ifp->if_index >= if_indexlim)
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return(0); /* XXX */
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#define SID scope6_ids[ifp->if_index]
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switch(scope) {
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case IPV6_ADDR_SCOPE_NODELOCAL:
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return(-1); /* XXX: is this an appropriate value? */
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case IPV6_ADDR_SCOPE_LINKLOCAL:
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return(SID.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL]);
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case IPV6_ADDR_SCOPE_SITELOCAL:
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return(SID.s6id_list[IPV6_ADDR_SCOPE_SITELOCAL]);
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case IPV6_ADDR_SCOPE_ORGLOCAL:
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return(SID.s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL]);
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default:
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return(0); /* XXX: treat as global. */
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}
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#undef SID
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}
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void
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scope6_setdefault(ifp)
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struct ifnet *ifp; /* note that this might be NULL */
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{
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/*
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* Currently, this function just set the default "link" according to
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* the given interface.
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* We might eventually have to separate the notion of "link" from
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* "interface" and provide a user interface to set the default.
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*/
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if (ifp) {
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scope6_ids[0].s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] =
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ifp->if_index;
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}
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else
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scope6_ids[0].s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0;
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}
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int
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scope6_get_default(idlist)
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u_int32_t *idlist;
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{
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if (scope6_ids == NULL) /* paranoid? */
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return(EINVAL);
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bcopy(scope6_ids[0].s6id_list, idlist,
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sizeof(scope6_ids[0].s6id_list));
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return(0);
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}
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u_int32_t
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scope6_addr2default(addr)
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struct in6_addr *addr;
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{
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return(scope6_ids[0].s6id_list[in6_addrscope(addr)]);
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}
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